Application Note AN_209. AN_209 PDIUSBD12 to FT120 Migration Guide
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1 AN_209 AN_209 PDIUSBD12 to FT120 Migration Guide Issue Date: The FT120 is a cost and feature optimized USB Full-Speed device controller. It communicates with a micro-controller over a generic parallel interface, and integrates USB device/slave functionality into a system. This application note describes how to implement the device in legacy designs where the PDIUSBD12 was being used, as well as some minor differences between the two chips. Use of FTDI devices in life support and/or safety applications is entirely at the user s risk, and the user agrees to defend, indemnify and hold FTDI harmless from any and all damages, claims, suits or expense resulting from such use. Future Technology Devices International Limited (FTDI) Unit 1, 2 Seaward Place, Glasgow G41 1HH, United Kingdom Tel.: +44 (0) Fax: + 44 (0) Web Site:
2 Table of Contents 1 Introduction FT120 vs PDIUSBD Features Pinout Reference Schematic BOM Changes Required Firmware Set DMA Functional Difference CLKOUT and SUSPEND Pin Differences IO Levels Ordering Information Summary Contact Information Appendix A References Document References Acronyms and Abbreviations Appendix B List of Tables & Figures List of Tables List of Figures Appendix C Revision History
3 1 Introduction The FT120 is a cost and feature optimized USB full-speed device controller. It communicates with a micro-controller over the generic parallel interface. The design closely matches the PDIUSBD12 which has been a very popular USB solution over the past decade, but is now becoming increasingly difficult to source in volume. To fill this gap in the market, the FT120T (28 pin TSSOP package) may be used in designs originally intended for PDIUSBD12 devices by following the advice in this application note. 2
4 2 FT120 vs PDIUSBD Features The main features of the two generations of devices are shown below. To maximize compatibility, the 28 pin TSSOP package has been selected. FEATURE FT120 PDIUSBD12 MECHANICAL Packages 28 pin TSSOP 28 Pin QFN 28 pin TSSOP SO28 Temperature -40 C to 85 C -40 C to 85 C ELECTRICAL VCC Supply 3V3 or 5.0V 3V3 or 5.0V IO Levels 3V3 (5V tolerant) 3V3 or 5.0V Operating Current 7mA 15mA Suspend current 83uA 15uA USB Modes Speed Full Speed Full Speed Transfer Modes Bulk / Isochronous / Interrupt Bulk / Isochronous / Interrupt DATA THROUGHPUT Bulk mode Up to 1MByte/s (typical) Up to 1MByte/s (typical) Isochronous mode Up to 1Mbit/s (typical) Up to 1Mbit/s (typical) DMA ENGINE YES YES Table 2.1 Feature comparison 3
5 2.2 Pinout The pinout of the two devices match as per the table below: Application Note PIN FT120T PDIUSBD12 DESCRIPTION 1 DATA0 DATA0 Bit 0 of bi-directional data. 2 DATA1 DATA1 Bit 1 of bi-directional data. 3 DATA2 DATA2 Bit 2 of bi-directional data. 4 DATA3 DATA3 Bit 3 of bi-directional data. 5 GND GND Ground 6 DATA4 DATA4 Bit 4 of bi-directional data. 7 DATA5 DATA5 Bit 5 of bi-directional data. 8 DATA6 DATA6 Bit 6 of bi-directional data. 9 DATA7 DATA7 Bit 7 of bi-directional data. 10 ALE ALE Address Latch Enable. The falling edge is used to close the latch of the address information in a multiplexed address/ data bus. Permanently tied low for separate address/ data bus configuration. 11 CS_N CS_N Chip Select (Active Low) 12 SUSPEND SUSPEND Device suspend(output) and wakeup(input) 13 CLKOUT CLKOUT Programmable Output Clock 14 INT_N INT_N Interrupt (Active Low) 15 RD_N RD_N Read Strobe (Active Low) 16 WR_N WR_N Write Strobe (Active Low) 17 DMREQ DMREQ DMA Request. 18 DMACK_N DMACK_N DMA Acknowledge (Active Low). 19 EOT_N EOT_N End of DMA Transfer (Active Low). Double up as Vbus sensing. EOT_N is only valid when asserted together with DMACK_N and either RD_N or WR_N. 20 RESET_N RESET_N Reset (Active Low and asynchronous). Built-in power-on reset circuit is present onchip, so this pin can be tied to VCC. 4
6 PIN FT120T PDIUSBD12 DESCRIPTION 21 GL_N GL_N USB traffic LED indicator (Active Low) XTAL1 XTAL2 XTAL1 XTAL2 24 Vcc Vcc Crystal connection 1 (6MHz); alternatively, a 1.8V square wave clock can be applied. Crystal connection 2 (6MHz) ; if the external clock signal, instead of the crystal, is connected to XTAL1, then XTAL2 should be left unconnected Voltage supply ( V); To operate the IC at 3.3 V, supply 3.3 V to both the VCC and 3V3OUT pins 25 USBDM D- USB D- data line 26 USBDP D+ USB D+ data line 27 3V3OUT VOUT V regulated output; To operate the IC at 3.3 V, supply 3.3 V to both the VCC and 3V3OUT pins Address bit. A0=1 selects command instruction; 28 A0 A0 Table 2.2 Pinout comparison A0=0 selects the data phase. This pin is ignored in the multiplexed address and data bus configuration and should be tied to HIGH. 5
7 3 Reference Schematic Figure 3.1 shows a reference schematic. All power and termination options are the same as per a PDIUSBD12 schematic. Figure 3.1 Reference Schematic 6
8 4 BOM Changes Required Application Note The only BOM change required to a design already using a PDIUSBD12 28 pin TSSOP device is to replace the device with the FT120. 7
9 5 Firmware Application Note The register map for the PDIUSBD12 and the FT120 are the same. This allows the control firmware used for the PDIUSBD12 to be compatible with the FT120 and therefore application software should not need to be changed. FTDI recommends that application software be revalidated with the new chip. Command Name Recipient Coding Data phase Initialization Commands Set Address / Enable Device D0h Write 1 byte Set Endpoint Enable Device D8h Write 1 byte Set Mode Device F3h Write 2 byte Set DMA Device FBh Write/Read 1 byte Data Flow Commands Read Interrupt Register Device F4h Read 2 bytes Select Endpoint Control OUT 00h Read 1 byte (optional) Control IN 01h Read 1 byte (optional) Endpoint 1 OUT 02h Read 1 byte (optional) Endpoint 1 IN 03h Read 1 byte (optional) Endpoint 2 OUT 04h Read 1 byte (optional) Endpoint 2 IN 05h Read 1 byte (optional) Read Last Transaction Status Control OUT 40h Read 1 byte Control IN 41h Read 1 byte Endpoint 1 OUT 42h Read 1 byte Endpoint 1 IN 43h Read 1 byte Endpoint 2 OUT 44h Read 1 byte Endpoint 2 IN 45h Read 1 byte Read Endpoint Status Control OUT 80h Read 1 byte Control IN 81h Read 1 byte Endpoint 1 OUT 82h Read 1 byte Endpoint 1 IN 83h Read 1 byte Endpoint 2 OUT 84h Read 1 byte 8
10 Endpoint 2 IN 85h Read 1 byte Read Buffer Selected Endpoint F0h Read n bytes Write Buffer Selected Endpoint F0h Write n bytes Set Endpoint Status Control OUT 40h Write 1 byte Control IN 41h Write 1 byte Endpoint 1 OUT 42h Write 1 byte Endpoint 1 IN 43h Write 1 byte Endpoint 2 OUT 44h Write 1 byte Endpoint 2 IN 45h Write 1 byte Acknowledge Setup Selected Endpoint F1h None Clear Buffer Selected Endpoint F2h None Validate Buffer Selected Endpoint FAh None General Commands Send Resume F6h None Read Current Frame Number F5h Table 5.1 Register list Read 1 or 2 bytes The bit mapping for each register is available in the FT120 datasheet. 5.1 Set DMA Functional Difference In register FB (Set DMA) bits 6 and 7 allow for interrupts to be enabled / disabled. With the PDIUSBD12, interrupts will be generated regardless of the setting in this register. With the FT120, the interrupt will be enabled/disabled according to the value set when used in DMA mode. To ensure maximum compatibility with PDIUSBD12 designs it is recommended the interrupts are enabled in this register. However new designs may use these bits to set the interrupts as per the design requirements. Firmware using non-dma mode is not affected. 9
11 5.2 CLKOUT and SUSPEND Pin Differences Application Note The FT120 has a variety of different clock modes configured with the Set Mode register F3 as shown in Table 5.2 affecting the CLKOUT and SUSPEND pin. Table 5.2 Clock Modes Modes 0 and 3 are 100% backward compatible with the PDIUSBD12, but for designs originally using mode 1, (NO LAZY CLOCK = 0 and CLOCK RUNNING = 1) it is recommended to alter the firmware to use mode 0. Thus ensuring the CLKOUT pin Lazy clock is enabled and the SUSPEND pin is logic 1 during suspend mode. For designs originally using mode 3, (NO LAZY CLOCK =1 and CLOCK RUNNNIG = 1) the SUSPEND pin will not drive high as per USBD12 designs. Firmware can be modified to set the CLOCK RUNNING bit of Set Mode command to be 0 (Mode 0 or Mode 2). Under this configuration the CLKOUT will switch to 30 khz suspend clock upon entering USB suspend state. To resume the USB bus, firmware needs to wakeup FT120 by drive the SUSPEND pin to LOW, and then issue Send Resume command to FT
12 6 IO Levels The FT120 has been designed to be used in 3V3 systems. The IO pins are designed to drive out at 3V3 levels, but support input levels from 3V3 to 5V. In many systems 3V3 output will be sufficient to drive 5V logic, but in other cases it may require additional logic to boost the logic level. The PDIUSBD12 device was designed to operate in 3V3 to 5V systems and as such is capable of driving out at 3V3 to 5V levels. 11
13 7 Ordering Information. Part Number FT120T-00-U Package 28 Pin TSSOP, Tube Table 7.1 Part numbers 12
14 8 Summary Updating an existing design from a PDIUSBD12 to the FT120 should be a simple process, requiring a small BOM change ie swap the PDIUSBD12 out for the FT120T. All existing and proven firmware shall run on the new FT120T as it did on the original device. This solution allows for a rapid upgrade to ensure designs which may have been deemed obsolete due to supply difficulties with the original parts can enjoy an extended life span. 13
15 9 Contact Information Head Office Glasgow, UK Future Technology Devices International Limited Unit 1, 2 Seaward Place, Centurion Business Park Glasgow G41 1HH United Kingdom Tel: +44 (0) Fax: +44 (0) Branch Office Hillsboro, Oregon, USA 7130 SW Fir Loop Tigard, OR USA Tel: +1 (503) Fax: +1 (503) (Sales) (Support) (General Enquiries) sales1@ftdichip.com support1@ftdichip.com admin1@ftdichip.com (Sales) (Support) (General Enquiries) us.sales@ftdichip.com us.support@ftdichip.com us.admin@ftdichip.com Branch Office Taipei, Taiwan 2F, No. 516, Sec. 1, NeiHu Road Taipei 114 Taiwan, R.O.C. Tel: +886 (0) Fax: +886 (0) (Sales) (Support) (General Enquiries) tw.sales1@ftdichip.com tw.support1@ftdichip.com tw.admin1@ftdichip.com Branch Office Shanghai, China Room 1103, No. 666 West Huaihai Road, Shanghai, China Tel: Fax: (Sales) (Support) (General Enquiries) cn.sales@ftdichip.com cn.support@ftdichip.com cn.admin@ftdichip.com Web Site System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level performance requirements. All application-related information in this document (including application descriptions, suggested FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user s risk, and the user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product described in this document, may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC
16 Appendix A References Document References FT120 Data Sheet Acronyms and Abbreviations Terms DMA USB Description Direct Memory Access Universal Serial Bus 15
17 Appendix B List of Tables & Figures List of Tables Table 2.1 Feature comparison... 3 Table 2.2 Pinout comparison... 5 Table 5.1 Register list... 9 Table 5.2 Clock Modes Table 6.1 Part numbers List of Figures Figure 3.1 Reference Schematic
18 Appendix C Revision History Document Title: Document Reference No.: FT_ Clearance No.: FTDI# 289 Product Page: Document Feedback: Send Feedback Revision Changes Date 1.0 Initial Release 2012-M Added section 6 on IO levels Update contact info
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